Rich: I don't know the part numbers for any of these larger engines, however after 1954 all IH four cylinder gas engines had displacment cast into the block as in C-123 used in offsets 200, etc. C-135 used in 404, C-153 used in 504, C-169 used in 300 and C-175 used in 350. These numbers are cast on right side of block, as I've typed it. All these engines were sleeved except the C-153.
I think Hal pretty well nailed the reason; C-123, C-135 and C-153 are all the same block, just bored larger. The C-169 and C-175 are the same block but much heavier than the smaller block, lot more steel in them, basically the main reason why they are a better engine for 35 to 45 hp.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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